Raspberry Gambas
Thanks to the work of some guys on the RaspberryPi forum, Gambas3 is now running on the little computer. So after a couple of hours work installing a new OS image with Gambas3 on it and getting the hang of it I have managed to get the bar chart program running. As before the Psion II is pretending to be the data-logger and is sending out random data in the format I have currently settled on. It works pretty well, but the RPi is being pushed close to its limits here and the mouse has a habit of becoming inactive. Ultimately I think I will need to learn Python and go down that route using the widget approach to get a GUI output, but there is a pretty steep learning curve there. The next step is to finish off the touch monitor and get a module (driver) for the touch panel and the calibration program running on the RPi.